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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88e9682c84835c8a09c5e8bd796caaec85337e756a5a7670ab4d7bcc8d7d869' 
  AND token = 'f/znn07+CIEzXmAxALI40wvdHKDV9sTDUwA4Ri4rY6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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