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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ce1812a6bb8d80883affc298d6abe66ca8245f375b75e9b66f62156d0adb12' 
  AND token = 'riz3aMBh1Hj2WShnb8yg9oFfQLDQa211s2TeQoFmxdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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