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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbaccf393e3cbd38382bf21c4310d4b9ec043e316219cc9e7e760843df36b418' 
  AND token = 'Bo8te87ViXGl9M0zEN8rIN35vEQmC2e7YcDfE7rmMVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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