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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd0784477214239503599a25f74cd26290c64818c01796af03b5eb50c57322c' 
  AND token = 'g4yT8PYZjcXjN12hhuttXnU2Fbmod7kd3yJ/6U9RADk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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