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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d41022e2d7d6a9ffac0d3fd829e0d5f72d1f18121ad037425922073b00ed4e' 
  AND token = 'Lbhh2p8RN9dvSqt4Ev5hYgmjLfKf5NuoNNkakV1VgKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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