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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b509cae54d3a79ca1f1acbc140e9a809e63800d55ad04802141c8e62a71f0db' 
  AND token = 'Aamtv+0YbM2z6Xu44njYfAY0LGM4U/3NQ2r7xiz7+Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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