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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0970b1d1f169180248571dc216c8f501d711536c744cc5129efec50c002a2ba7' 
  AND token = 'rEe3+AJaIH7PMPkybFO65R7Wztr8hlVEwW5/gcLc4nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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