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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ced31942436ce6f0d09b2beffefcef85c574dd47081471b2f9a018e5aba065' 
  AND token = 'GglFWHoRYg1txNXlQGaYqZKsRA+sau2fVCL5u1Ndzfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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