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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b3ff28e03bc1d9efa6c196e07af69590d616aaa4259e6a229ba92fec563c2c' 
  AND token = 'qclAmMc2g4P+Hju2FEK0S4QlPOqSYEo26OIOAuj1FBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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