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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff11b27f7bbf71d474787b3988a52be864bed2ad068951750f1a83f38f6fa83f' 
  AND token = 'm5IwtDExs2wHGMYaztXrB2AB4I4o7knVE6km8KWtKMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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