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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51806cb3303fa1f761a9553917eee0682fd70d21903fb7dd7e89deb4787ae9df' 
  AND token = 'Zgp+pewOv85tTJsjZNz7CxKiEVZ0IPuQOwNP1OADsp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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