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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abde9b0d15113f99d9c9946080718b82531eea587c4d3f0b6b6448800a3d336' 
  AND token = 'f302jfZK0Nxg7iinbhYaNxGYoQgVRLlyFjnq7K46Fe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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