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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2aca40f96de80726c94b05a097947951c8185ca5efbf1467a528165b62a4738' 
  AND token = '2J1V23QGH3xvxNQ04v6XAOx+m5/iUIl33m1VDTR8GpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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