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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37beae4134243e9e5be37eb2d5d7759e3c38cae29ad4b3d15d304af13f1b554' 
  AND token = 'AYSTGGWEDkuu71HwBqX+lSRbWGFKEpW6eltQKUqB03U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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