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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ac47e25f04059c70e166e6760ffb6e644ccc404b164b1dae5f99d4bb56b67a' 
  AND token = 'iW/ExlXPd6hw5y3j/gtFAaAQ0SrCZq3SDH+GsuIq+6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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