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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465eeefa3633558a3a93db0f0dbaa9033fdd934e64e61a21d583f6a47ddcd2ee' 
  AND token = 'vmZC/COkNUP/EdQ2ejiXffH1apG4o4ZguoghhmlAP0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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