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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978d5965d9c3d387773559bb1221c88ec0944f2926e027c265638cc0470258d4' 
  AND token = 'Tr2ffDqmsOUKko4Gmmu/l6af6PabOFzDri6N/BqGEAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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