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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9cd5833dd04cd1d13fa3a86e17149ce49641c8e39f750c4e98b802c2859036' 
  AND token = 'NI1t8fcvnS8l/oFPQSBh0WMmeaPcuwJQI5IE+eHuKmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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