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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd121d4b6ff66cfba691276cd656501e32f38a1d00eb1bc25fe025cd7481a49' 
  AND token = 'ShU9uls64czCxfJp0sB618XIHJop1R+r+1LHmrcMHcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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