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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24212bf6b27db4665ae0133068ac0edf425a65d4b8d2212cfb927d9e648238f' 
  AND token = 'RVQVi95GhAWDMEqijFNtMI6jtv8e8Wie7G/DR65Uego=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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