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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a247c346cd563c916ebaadd3172e51c0e42d663072de635c5e6a53f442df9bb' 
  AND token = '/cYcKtOx4vA49i66S3Hh/HwPDYfM9DNZXp7lQQdHMP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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