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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85e489db7b99802ff29218f5714ba5afcae688487106988ae561ea4a5c24088' 
  AND token = 'O58oi7XV5vN9V/i/h7Z46tE5LiBnBafxOjs5UYFYuGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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