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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d93b539815063b4dcfa4e99e98509fe3ad65b1de121da130aa4c8e35bd188c' 
  AND token = 'Q7zWeEhLTlNmFOQucwda4Soz2mC5rj7CjhGBFb1cOPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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