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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2836a960fc7cc9e07b3704e01c640ab3820bad448e4386f7a9cbe0122318fd' 
  AND token = '9whNj9TGMWsuVFIpL+DW30+ykKRVW1hhfIQbMX7qFU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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