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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957c1234a33ffdf0decbd7a46d1b6fb9214d6096f052c6af3f302c39d9ef5a8b' 
  AND token = 'MR6PhCaMB6gdpfepAEa5HTNvmb13U/aTJd669F2CJlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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