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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415e40cc405b63a112f4641522fcc3ac2ec08b55cd56d4ef71692708a2fe6ffe' 
  AND token = 'HoPujOCF3zbTYagRdB6ZNB0YiyW4ZQHrFecaz7VleRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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