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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9974ee6953afd36bba9e8c86242e79b47451c867365f54974425ce642ef1c9fd' 
  AND token = 'xw0ozxF29D7cSd/3c1xc1Sdn7insAWjcfG1fZbJ0P5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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