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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37118230f2a61605327cda7d7c7a8072cdfd4c588905b57c55d7010df6c254e' 
  AND token = '/+j+flWOZ/H6OfAp6ySX9TBpq7FD7aCixtZvj4EyPYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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