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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ede126289ebd3ae7224823b8ce667b2c558e4b845d67081e4b09070d84453c2' 
  AND token = 'Aw3+gZhYY7QeB8qxbjZqoDxsiELdQyTdcNI0A/eQHtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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