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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132cf181dd9d1043754c2c9ba4feb49de4c68175bfe736c0569b745bd16ddc5a' 
  AND token = '+/pdAa4RSH/fiPHEUa79Yv97NAp+FrYN3wTClhNmF+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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