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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e1829acc9491b7660819bdf04ecde0b24fd6ecaa3e01bf22d1c13bf4616d6c' 
  AND token = 'enrG6sHOQ1uy5N0lq7Ix/I3uhv/u2/s3B9Eo/jXTVlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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