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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007a76f29f66f75f71eb4f04134197944b0f3885f2c330e69f05bae521d88a97' 
  AND token = '2nR17pj2AsgIZrrQHe6X8wUeOhIPqPd+9t71qGM80NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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