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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cd2704fbfb27f58c6a1584a71b54ad7cc10ab167919a781532baa5756ded59' 
  AND token = '88jEW9ArCgR8GGlT1c+9FtAZGCvDUWnrYLDtivS9VCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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