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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6ce1c85a583d4751f3ecf60c45e94e6928ab406c739fa14f7c166fa80fe865' 
  AND token = 'fhx4No5kk2DKkx0liRK4E3t8aUdCMRRYgmxgGcBZVBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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