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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27f2b48ba95f4343a121d3b6db591906ae64f3f46a3da172bea925a1558964d' 
  AND token = 'duzH1sHCMB15kpjJJIltKT9igxF2omzPC2iomoXy3yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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