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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fdf36ebea9f4cd96e32423c8d14e4b62cc114c58e8a4fe183ada4e312e73e46' 
  AND token = '8prPEbw6psTYIIh2l0vLBP1po61jpMATRxOV+PgQ+/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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