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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d62dac7b182f9324fdc176dadc09068ec22752f157ec68788c6b0ce1af7a9b9' 
  AND token = 'py1d1wQrr3X4oh7aPAUwdCVFK34/RS7R1kBhuhgj4ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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