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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c95c0c90403f51856058193cca3ea953ffbcaed92230e765144291d805b71b' 
  AND token = '9zDHU0uttGlksxX/qBkVUToE4ZI5PXXT9RcTsbzq4SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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