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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3389a9d2d166e44a65e9a2f291dc6f1d45571a314f217fa1e781e39945bad6fa' 
  AND token = 'kXh9e3auctawhhqWF0+2ajjaB9nC06Hc/GSeEnCxTaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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