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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e751dbd86ec73ab3e2c91b85aa155fae1a3d42142e886660b96fbac882ceac24' 
  AND token = 'gVgnnwAG5xmUJz7b3V5ijME0w1e3Iaa2Vp8vkQqX/SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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