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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bbe1d0980851f767fe279a08a702204422aebc73e0214cb96b3ca0b547fac18' 
  AND token = 'NRAp2B1nELR6zpeBIQiZZifiQQpuNf1yLuoZzj0uKX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}