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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7affef5459953b708b09c7bcf7c418a63526fca5428e82fcbd20ecb976263fc7' 
  AND token = 'Osd2cbri2AMeNX68ToVhn92vZ0MKxgQZP3M+SfReIT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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