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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961d3039421e61974b5ed50c9dabd01c52893bd466d9a2fd6dec3358758c51fc' 
  AND token = 'oo/zgC124zhBb7XW1xev7zwEIFDWHtZ7qeLebLrv6U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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