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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac86e667af05baced125e5f5048b3d46a1fd28dfa627fdefea37602939496c3' 
  AND token = 'dMVp17xLNUYoBQGi/6ZD2PGT6bPjASydBsf9E+byEdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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