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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c6564423db9344af55eb69c901e10862bddf61b12f599ea8da0cc21a3c70d3' 
  AND token = 'gmVw+mZWACGfftf6fBG3Cr8ShN7lfAHuwI9BT0XBi9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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