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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1fd38a66865e4568e4d42c112be6369bfcc5a9dfb2a96f1ad07f0bc5f591fd' 
  AND token = '1/R4k6bI/ST3vewxkFXBZRfO0lAaLq4CH0yhY4G1tQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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