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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985f8ce7a0d20a8e96d2e14cd492f10b51aa0f52aaeef3a9718de66c85c581de' 
  AND token = 'JTDynMIAavrT2X/lakweo1Vibvo0LyG7OyioDLaTU1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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